Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)

Villarrica is an active stratovolcano located in the Southern Andean Volcanic Zone. About 13,800 years BP (conventional radiocarbon ages), this volcano experienced major explosive eruptions which resulted in the emission of a sequence of pyroclastic flows, known as the 'Licán Ignimbrite',...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Lohmar,Silke, Robin,Claude, Gourgaud,Alain, Clavero,Jorge, Parada,Miguel Ángel, Moreno,Hugo, Ersoy,Orkun, LópeZ-Escobar,Leopoldo, Naranjo,José Antonio
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2007
Materias:	Explosive volcanism Mafic pyroclastic flows Phreatomagmatism Southern Andean Volcanic Zone Villarrica volcano
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082007000200004
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0716-02082007000200004
record_format	dspace
spelling	oai:scielo:S0716-020820070002000042007-09-07Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)Lohmar,SilkeRobin,ClaudeGourgaud,AlainClavero,JorgeParada,Miguel ÁngelMoreno,HugoErsoy,OrkunLópeZ-Escobar,LeopoldoNaranjo,José Antonio Explosive volcanism Mafic pyroclastic flows Phreatomagmatism Southern Andean Volcanic Zone Villarrica volcano Villarrica is an active stratovolcano located in the Southern Andean Volcanic Zone. About 13,800 years BP (conventional radiocarbon ages), this volcano experienced major explosive eruptions which resulted in the emission of a sequence of pyroclastic flows, known as the 'Licán Ignimbrite', the bulk volume of which is estimated in -10 km³ (non-DRE, Dense Rock Equivalent). The deposits mainly consist of massive pyroclastic flows and stratified pyroclastic surges. Typical flow fades showscoriaceous bombs, dense juvenile blocks, lithics and scoria lapilli immersed in a dark-grey to brownish matrix, whereas surges expose lapilli-sized scoria in a fine, light-brown or yellow-green matrix. Juvenile clasts range from 55 to 58 wt% Si0(2) in composition. This paper describes the general architecture of the Licán Ignimbrite deposits and, based on SEM (Scanning Electron Microscope) observations and lithologic data, emphasizes the role of fragmentation due to magma-water interaction during the eruption. The results indicate that gas expansion was an important process. However, field characteristics, surface textures of ashes, enrichment of lithics towards the top of the sequence and variable palagonitization of matrix glass show the intervention of water since the initial stages of the eruption and its increasing influence during the later phasesinfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.34 n.2 20072007-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082007000200004en10.4067/S0716-02082007000200004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Explosive volcanism Mafic pyroclastic flows Phreatomagmatism Southern Andean Volcanic Zone Villarrica volcano
spellingShingle	Explosive volcanism Mafic pyroclastic flows Phreatomagmatism Southern Andean Volcanic Zone Villarrica volcano Lohmar,Silke Robin,Claude Gourgaud,Alain Clavero,Jorge Parada,Miguel Ángel Moreno,Hugo Ersoy,Orkun LópeZ-Escobar,Leopoldo Naranjo,José Antonio Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)
description	Villarrica is an active stratovolcano located in the Southern Andean Volcanic Zone. About 13,800 years BP (conventional radiocarbon ages), this volcano experienced major explosive eruptions which resulted in the emission of a sequence of pyroclastic flows, known as the 'Licán Ignimbrite', the bulk volume of which is estimated in -10 km³ (non-DRE, Dense Rock Equivalent). The deposits mainly consist of massive pyroclastic flows and stratified pyroclastic surges. Typical flow fades showscoriaceous bombs, dense juvenile blocks, lithics and scoria lapilli immersed in a dark-grey to brownish matrix, whereas surges expose lapilli-sized scoria in a fine, light-brown or yellow-green matrix. Juvenile clasts range from 55 to 58 wt% Si0(2) in composition. This paper describes the general architecture of the Licán Ignimbrite deposits and, based on SEM (Scanning Electron Microscope) observations and lithologic data, emphasizes the role of fragmentation due to magma-water interaction during the eruption. The results indicate that gas expansion was an important process. However, field characteristics, surface textures of ashes, enrichment of lithics towards the top of the sequence and variable palagonitization of matrix glass show the intervention of water since the initial stages of the eruption and its increasing influence during the later phases
author	Lohmar,Silke Robin,Claude Gourgaud,Alain Clavero,Jorge Parada,Miguel Ángel Moreno,Hugo Ersoy,Orkun LópeZ-Escobar,Leopoldo Naranjo,José Antonio
author_facet	Lohmar,Silke Robin,Claude Gourgaud,Alain Clavero,Jorge Parada,Miguel Ángel Moreno,Hugo Ersoy,Orkun LópeZ-Escobar,Leopoldo Naranjo,José Antonio
author_sort	Lohmar,Silke
title	Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)
title_short	Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)
title_full	Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)
title_fullStr	Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)
title_full_unstemmed	Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)
title_sort	evidence of magma-water interaction during the 13,800 years bp explosive cycle of the licán ignimbrite, villarrica volcano (southern chile)
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082007000200004
work_keys_str_mv	AT lohmarsilke evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT robinclaude evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT gourgaudalain evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT claverojorge evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT paradamiguelangel evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT morenohugo evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT ersoyorkun evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT lopezescobarleopoldo evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile AT naranjojoseantonio evidenceofmagmawaterinteractionduringthe13800yearsbpexplosivecycleofthelicanignimbritevillarricavolcanosouthernchile
_version_	1718439440240607232

Evidence of magma-water interaction during the 13,800 years BP explosive cycle of the Licán Ignimbrite, Villarrica volcano (southern Chile)

Ejemplares similares